Greek Valerian aka Jacob's Ladder (Polemonium reptans)

2008-5-3 Fort DuPont SP, Delaware City, DE
http://uswildflowers.com/detail.php?SName=Polemonium%20pulcherrimum
P. reptans is found in the eastern half of the U.S.
P. van-bruntiae has protruding stamens with reddish anthers and is rare in a few states of the northeast